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This release brings the following improvements: gimx-launcher shows explicit error messages for most common errors, and indicates possible causes. On Windows 7, the installer checks if KB3033929 is installed, to prevent a failure of the UsbDk installation. The redistributed cp210x driver gets update...

Did any of your attempts change the way Windows recognizes the board?
If not, it still should be possible to load the blinky sketch using the Arduino software. The result will tell if the board is defective.